Help me

I dont understand it and it weird to me

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.